I agree that Somg of Blades and Heroes sounds perfect for what you're looking to do. I use it for Dark Ages historical and it works great. Take out the fantasy special abilities and just use ones that sound "right" for your period.
I'm starting up a Viking era campaign for my Sunday night game club, soon. SBH is easily tailored to what you want. The Special Abilities allow you to treat it like a toolbox and build the game you want. For example, I took out all the Group Moves for my games as I don't like its feel. Feels more like a skirmish with all figs moving as individuals.
Mike Demana